Attacks on two sites at the heart of Saudi Arabia's oil industry shut down more than 5% of global supply, sent oil prices as much as 20% higher and prompted the United States to blame Iran despite Tehran's denials.
* Yemen's Iran-aligned Houthi group, which is battling a Saudi-led coalition in Yemen, claimed responsibility for the attacks on Saturday on sites run by state-owned Saudi Aramco.
* U.S. Secretary of State Mike Pompeo ruled out Yemeni involvement and accused Iran of leading the attacks.
* U.S. President Donald Trump said the United States, which is embroiled in a row with Iran over its nuclear ambitions, was "locked and loaded" for a potential response.
* Russia said it was unacceptable to discuss possible retaliation and said that using the incident to increase tensions around Iran was counterproductive.